| Value | Category | Cases | |
|---|---|---|---|
| 1992 | 1 |
0.2%
|
|
| 1995 | 1 |
0.2%
|
|
| 1996 | 2 |
0.5%
|
|
| 1998 | 3 |
0.7%
|
|
| 1999 | 1 |
0.2%
|
|
| 2000 | 10 |
2.4%
|
|
| 2001 | 4 |
1%
|
|
| 2002 | 2 |
0.5%
|
|
| 2003 | 6 |
1.4%
|
|
| 2004 | 24 |
5.8%
|
|
| 2005 | 27 |
6.5%
|
|
| 2006 | 61 |
14.7%
|
|
| 2007 | 47 |
11.3%
|
|
| 2008 | 98 |
23.6%
|
|
| 2009 | 85 |
20.5%
|
|
| 2010 | 27 |
6.5%
|
|
| 2011 | 16 |
3.9%
|
|
| Sysmiss | 46 |